Boulder City is a city in Clark County, Nevada, United States. It is approximately 20 mi (32 km) from the City of Las Vegas. As of the 2010 census the population of Boulder City was 15,023.

Boulder City is one of only two cities in Nevada that prohibit gambling.

Boulder City was originally built in 1931 by the Bureau of Reclamation and Six Companies, Inc. as housing for workers who were building Hoover Dam.

The land upon which Boulder City was founded was a harsh, desert environment. Its sole reason for existence was the need to house workers contracted to build the Hoover Dam on the Colorado River (known commonly until official naming in 1947 as the Boulder Dam). Men hoping for work on the dam project had begun settling along the river in tents soon after the precise site for the dam had been chosen by the Bureau of Reclamation in 1930. Their ramshackle edifices were collectively known as ‘Ragtown’.

The sheer scale of the Dam and duration of the project required the Bureau of Reclamation to consider the construction of a semi-permanent town rather than a temporary arrangement. Boulder City was exceptionally rare as an example of a town fully planned under government supervision. This is unlike 19th Century privately funded Company Town examples found in the United Kingdom, such as Port Sunlight or in the United States, such as Pullman, Chicago.